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v3.20.1

Intangible assets - Costs and accumulated amortization (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
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Cost |  |
Finite-Lived Intangible Assets, Gross | $ 9,890,000 | $ 5,900,000
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (4,850,000) | (4,008,333)
Intangible assets, net | 5,040,000 | 1,891,667
Non-compete agreements |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 530,000 | 400,000
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (320,556) | (233,333)
Trade names |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 2,700,000 | 1,400,000
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (380,000) | (272,222)
Certifications/programs |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 2,000,000 | 2,000,000
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (2,000,000) | (1,944,444)
Customer backlogs |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 460,000 | 100,000
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (130,000) | (100,000)
Customer relationships |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 2,000,000 | 2,000,000
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (1,958,333) | $ (1,458,334)
Facility management contracts |  |
Cost |  |
Finite-Lived Intangible Assets, Gross | 2,200,000 |
Accumulated amortization |  |
Finite-Lived Intangible Assets, Accumulated Amortization | $ (61,111) |

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